Fortran: Fix some problems with the reduce intrinsic [PR119460]

Fortran:  Fix some problems with the reduce intrinsic [PR119460]

2025-04-09  Paul Thomas  <pault@gcc.gnu.org>
	    and Harald Anlauf  <anlauf@gcc.gnu.org>

gcc/fortran
	PR fortran/119460
	* iresolve.cc (generate_reduce_op_wrapper): Increase the size
	of 'tname'. Change intent of 'a' and 'b' to intent_in.
	* trans-decl.cc (add_argument_checking): Do not test artificial
	formal symbols.
	* trans-expr.cc (gfc_conv_procedure_call): Remove reduce_scalar
	and the blocks triggered by it.
	* trans-intrinsic.cc (gfc_conv_intrinsic_function): Set the
	result of non-character, scalar reduce to be allocatable.

gcc/testsuite/
	PR fortran/119460
	* gfortran.dg/reduce_2.f90: Add test to check that deferred len
	characters cannot slip through.
	* gfortran.dg/reduce_3.f90: New test
	* gfortran.dg/reduce_4.f90: New test

libgfortran/
	PR libfortran/119460
	* intrinsics/reduce.c (reduce): Correct error message about
	mismatch between dim and the rank of array. Output the values
	of both. Correct the evaluation of the result stride and
	extent.
	(reduce_scalar): The front end treats the result as an
	allocatable so eliminate memcpy and free. Return the base-addr
	of the local descriptor.
	(reduce_c): Correct the type of the string lengths.
	(reduce_scalar_c): Correct the type of the string lengths.Test
	to see if 'res' is allocated. If not then return the base_addr
	of the local descriptor.